EP 0049087 A1 19820407 - Radar, sonar and similar systems.
Title (en)
Radar, sonar and similar systems.
Title (de)
Radar, Sonar und ähnliche Systeme.
Title (fr)
Radar, sonar et systèmes semblables.
Publication
Application
Priority
- GB 8031288 A 19800927
- GB 8122718 A 19810723
Abstract (en)
A transmitter (2) generating a train of pulses arranged in groups of two, each group including a long pulse and a short pulse of different frequencies. These long and short pulses are separated in a receiver (3) by a range gate (12) which passes the pulses through the upper receiving channel when reflected from long ranges and the lower receiving channel when received from short ranges. The upper channel includes a filter (19) which passes only the long pulses (which are frequency swept). These pulses are compressed in a compressor network (20). <??>The lower channel includes a filter (15) which passes only the short pulses which, in this particular embodiment, are not frequency-swept. The transmitter (2) reverses the order of the pulses in adjacent groups. Alternatively, both the long and short pulses may all be frequency-swept. In either event there are adjacent pairs of swept pulses in contrast to known systems in which each swept pulse has immediately been preceded or followed by an unswept pulse.
IPC 1-7
IPC 8 full level
G01S 13/10 (2006.01); G01S 13/30 (2006.01)
CPC (source: EP US)
G01S 13/106 (2013.01 - EP US); G01S 13/30 (2013.01 - EP US)
Citation (search report)
- EP 0016597 A1 19801001 - MARCONI CO LTD [GB]
- US 3945011 A 19760316 - GLASGOW JOHN ARTHUR
- FR 2370988 A1 19780609 - HOLLANDSE SIGNAALAPPARATEN BV [NL]
- US 3267467 A 19660816 - LUCIEN GERARDIN, et al
- FR 1344203 A 19631129 - THOMSON HOUSTON COMP FRANCAISE
- EP 0022410 A1 19810114 - COMMISSARIAT ENERGIE ATOMIQUE [FR]
Designated contracting state (EPC)
BE CH DE FR IT NL SE
DOCDB simple family (publication)
EP 0049087 A1 19820407; EP 0049087 B1 19861203; EP 0049087 B2 19910313; DE 3175682 D1 19870115; US 4626855 A 19861202
DOCDB simple family (application)
EP 81304344 A 19810922; DE 3175682 T 19810922; US 66493584 A 19841025